building your own pc 2

8/7/2019 Building Your Own PC 2

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Building Your Own PC, Part 2:Assembly Step by Step

Guidelines For Building Your Own PC

In Part 1 of this series, we covered the fundamentals of the components used in today's PCs,discussed some of the important aspects of hardware configuration, and provided someshopping tips. Now, in Part 2, we will delve deeper, using a full tower case to explain how toassemble a standard PC.
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Table of Contents

Guidelines For Building Your Own PC

An Overview Of Steps Involved

Opening The Empty Case

Preparing To Fit The Components

Fitting The Motherboard

Installing The CPU And Cooler

Installing The RAM

Graphics, Sound And Network

Installing The Hard Disk And Floppy

Installing The CD-ROM Drive

Connecting The Ribbon Cables Drive Power Connectors

Front Panel Connections

Final Check

An Overview Of Steps Involved

First, let's take a look at the various steps to putting together a PC.

Opening the empty case;

Preparing to fit the components;

Fitting the motherboard;

Fitting the RAM, processor, and cooler;

Installing the graphics card and sound card;

Fitting the hard disk and floppy drive;

Installing the floppy and CD-ROM drives;

Connecting the ribbon cables;

Powering the drives and motherboard;

Connecting the cables for the case front panel;

Final check.

The above list is intended to be used as a general guide. In practice, you can vary the actualorder of assembly to some degree. We use a tower case in our demonstration because itmakes for clearer illustrations. The same assembly principles apply for midi and mini cases.
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The case we use has a slide-out tray for the motherboard and the expansion cards. There are avariety of case designs on the market, and we've discussed this in depth in an earlier article,entitled How To Select The Right Case . Take time to familiarize yourself with the casebefore installing any components in order to avoid having to remove some of them later!

Opening The Empty Case

Empty case with motherboard tray withdrawn.

Our tower case is built to ATX specification and includes a 300-watt power supply. Two side

panels can be individually removed after undoing the screws. Some other cases have a one-piece outer cover in the shape of an upside down 'U.' No matter how the case is constructed,you can normally gain access to the interior of the PC-to-be from both sides.

The price of a case is a good indicator of its modularity and build quality. Cheaper cases oftenforce you to assemble the PC in a specific order, are made of softer and/ or thinner metal, andmay contain sharp edges. Expensive cases provide clever design features, a more solidconstruction, better finish, and are often fitted with more capable power supplies.

When you have opened the case by removing the side panels, you will see what accessoriesthe case manufacture has supplied. A power cord and screws should always be included, andyou will also often find a set of case feet.
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Preparing To Fit The Components

Overview of all components (from left to right and top to bottom): network adapter card; floppy disk drive; CD-ROM drive;sound card; hard disk; ribbon cable; graphics card; RAM; CPU cooler; and, motherboard.

Let's take another look at the photo. The inclusion of a component from a particularmanufacturer does not imply a recommendation on our part. We use them to illustrate theinstallation procedure of similar components. The choice of components is entirely up to you.You can always find reviews of the latest products on the Tom's Hardware site, together witharticles on the latest developments and product recommendations.


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Fitting The Motherboard

Empty tray with six motherboard spacers.

Our case has a slide-out tray, which provides a very elegant way to install the motherboardand all of its components. Cheaper cases will have a mounting plate fixed permanently to thecase. If you have this type, you should first lay the case on its side.

Next, screw in the spacer mounts for fixing the motherboard. The photo shows six spacersalready fitted to the mounting plate. There are usually more holes drilled in the mounting platethan you actually need. There are standard locations for these holes on the mounting plate,which correspond to the holes on the motherboard. How many of these are actually useddepends on the board manufacturer. Cases are normally designed to accept any motherboard.Compare the available holes with the ones on your motherboard to determine where to fit thethreaded spacers.


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Spaced well away from the metal - the motherboard on the mounting plate.

Installing The CPU And Cooler

Lift the lever on the CPU socket.


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When the processor is in its socket, push the lever back down.

First, insert the CPU in its socket. To do this, raise the small lever at the side of the socket. If you examine the CPU from underneath, you will notice that there is a pin missing at onecorner. Match this corner with the corner on the socket where there is a hole missing. Theprocessor is keyed in this way to make sure it is inserted correctly. Please bear in mind thatyou should not force the CPU when inserting it! All pins should slide smoothly into the socket.If you are sure that you have positioned the CPU correctly (using the missing pin as

reference), yet are unable to insert the CPU, it is likely that one of its pins is bent. If this hashappened, straighten the pin using tweezers or a screwdriver. Once you have installed theprocessor, lock the lever back down.

Don't Forget To Use Thermal Paste Or A Thermal Pad


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Applying thermal paste to the processor.

You must apply thermal paste or a thermal pad to the top of the CPU. This will help to transferheat from the processor to the cooler. Failure to apply a thermally conductive medium to theprocessor can cause it to fail! Unless you use thermal paste, any slight misalignment of thecontact surface of the cooler, or even the presence of tiny specks of dust, will prevent heatfrom being efficiently transferred away from the processor. Thermal paste also fills themicroscopic valleys in the contact surface of the CPU (known as the die). Some coolermanufacturers supply thermal paste with their products. If yours did not, it is available frommost good computer or electronics stores and costs around two to three dollars.

Mounting The Cooler

A cooler made of copper is recommended, since this material is a very efficient heat conductor.You should know your processor's socket type when buying a cooler. You have a choice of twotypes of cooler - one suitable for both Socket A/462 and Socket 370, or one just for Socket423 (Pentium 4).


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Make sure that the cooler is in the correct position. Here is the cooler about to be connected with the socket.

Clips fix the cooler to the socket. This applies to Socket A/462 (AMD) and Socket 370 (Pentium III and C3).


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Fan Power Connection

Plenty of air flow. Here is the power connection for the cooler's fan.

You may have wondered why the connector lead for the fan has three wires. Two of thesecarry the power; the third is used for monitoring the speed of the fan. Therefore, the BIOS isalways aware of the speed at which the fan is running.

Minor Differences With The Pentium 4 System

Socket 370 (Intel Pentium III or Via C3), Socket A/462, and Socket 7 all use the same methodof mounting the cooler. However, Socket 478-based Pentium 4 systems are slightly different.Intel specifies that motherboard manufacturers should provide a plastic guide rail to ensurethat the cooler is always mounted flat to the surface of the processor. Also, the cooler is notlocked down with clips but with a snap-in system, as shown in the following pictures.


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Pentium 4 motherboards have a socket with 478 pins and a guide for the CPU cooler.

Attaching a Pentium 4 cooler


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Installing The RAM

The RAM must be suitable for the motherboard. There are currently three types of RAMavailable: SDRAM, DDR SDRAM and RDRAM. The motherboard's chipset determines which typeof RAM may be used. You will find the specification on the motherboard's box or in themotherboard manual.

Installing RAM. A notch at the bottom of the memory module ensures that the RAM is fitted correctly. The notch is located indifferent places on SDRAM, DDR SDRAM and RDRAM.

DIMM memory modules have a notch underneath that lines up with a key on the memoryslots. Although it is not possible to insert the modules the wrong way, you should line up theRAM with its slot before installing it. Then, carefully press the module into the slot. Caution isrecommended, as too much pressure may damage certain tracks on the motherboard. It isbest to push one side down first, and then the other. The notch will snap into its key as soonas one side is seated correctly. To make sure it is seated correctly, you can always take the

memory module out again. Releasing the clips will pop the module out of its socket. Then, youcan just lift it out.

Passed the first hurdle. Motherboard with processor, cooler and memory.


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Graphics, Sound And Network

In place - sound card (left) and graphics card (center) in white PCI slots. There is room for a network card, i f required.

Nowadays, graphics cards are usually fitted in the AGP slots provided specifically for thispurpose. These are brown in color, in contrast to the PCI slots, and are generally located in thecenter of the motherboard. PCI graphics cards are rarely used. Now, select a PCI slot for eachof your other plug-in cards, including the sound card. Before fitting an expansion card, removethe appropriate slot insert from the back panel of the case (or of the motherboard tray). As arule, you need to undo a screw to do this, although sometimes convenient plastic clips areused. The insert may also form part of the back panel.

Choosing a location for a PCI card will not usually be a problem on a simple system. In ourexperience, however, selecting an appropriate PCI slot can sometimes be problematic withsome brands of motherboard. For example, IRQs can be reserved twice or even three timesover. Resource conflicts can make it difficult for the operating system and motherboard towork together properly. This can often be solved by moving the offending PCI card to anotherslot or by manually reassigning IRQs. The other reason is more practical. If you see a largeheat sink on a plug-in card, perhaps even with a fan on top, the chip underneath will beproducing a lot of heat that has to be removed. There is only one reason we did not fit thesound card next to the graphics card: we wanted to keep some space between the cards inorder to prevent heat buildup.

Installing The Hard Disk And Floppy

We assume that you have already configured your hard disk the way you want it - single,master, or slave. The photo below shows the hard disk already fitted. As you can see, we canlook right through the case here. If we had slid the motherboard tray back into position, itwould have been impossible to screw the hard disk in from the left.


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At the moment, we still have good access to the hard disk (bottom) and the floppy drive (top). You can see the screws for thedrive on the side.

Use two screws per side on each drive. We would like to touch briefly on the topic of drivecooling, as it is quite important with the current 7,200 rpm drives. Hard disks running at 7,200rpm can quickly reach temperatures in excess of 50C. You should, therefore, always leavesome space above them to prevent heat buildup. The power supply fan is normally powerfulenough to provide adequate air circulation inside the case.

Installing The CD-ROM Drive

Installing a CD-ROM drive is similar to installing a hard disk. First, check that the jumperconfiguration is correct.

CD Drive In Drive Cage.

You only get to see the metal below the decorative plastic front panel when installing yoursystem; the case metal is actually hidden by plastic panels. The entire front section, or at leastthe part where the drives will be installed, is manufactured from a single, large piece of metal,in which the drive holes are then punched. For some years now, the CE norm for cases has


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specified this kind of metal panel, as only metal can reduce electromagnetic emissions - theprocessor usually being the worst offender in this area.

In practice, there are two options. If the metal knockouts are pre-stamped, you have to eithertake them out using metal cutters, or knock them out using force. If you have a high qualitycomputer case, you can remove and replace these metal panels whenever you like. Checkcarefully to see if there is an easy way to remove these panels that will reduce the chances of your accidentally damaging one or more of them.

When we have opened up the hole, we can feed the CD-ROM drive in and screw it into place.You will need the fine-threaded type screws. Always use four screws. Be careful not to over-tighten the screws, as excess pressure can put a strain on the case that could lead to twisting.The faster a drive's rotational speed, the more serious the effect. Tighten the screws onlyenough to ensure that the drive is secure. Heat is a consideration with CD-ROM drives, as it iswith disk drives.

Connecting The Ribbon Cables

Your PC should now look similar to the one in our photograph. All key components, such as themotherboard, processor, RAM, graphics card, sound card, hard disk, CD-ROM and floppy, have

been installed. Now it is time to connect the cables.

PC still without the cables


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As you will be aware after reading Part 1, there are two main cable types: the 34-pin cable forthe floppy drive and the 40-pin IDE cable (with 80 wires) for the hard disk and CD-ROM.Cables are always color-coded to show pin 1. Most drives also provide some kind of identification for pin 1. If you find that this is not the case, just remember that pin 1 is the onenext to the power plug.

Ribbon cable. The markings show the direction in which the power flows. Bottom: 80-pin for hard disk. Top: 34-pin for floppy.

Drive Power Connectors

Four-pole for 5 and 12 volts. Disk drive power connector on the right next to the ribbon cable.


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Power supplies are fitted with at least five plugs for delivering power to the drives. If you needmore than this, consider buying one or more splitter cables. A splitter cable provides twoconnectors from a single one. The corners of the plugs and sockets are keyed to ensure correctpolarity.

Floppy drives have smaller plugs, which are easily recognized among the cables coming fromthe power supply. Finally, there is the large ATX plug that plugs into the power socket on themotherboard. ATX12 or P6 should be connected where required. The latter provides extra

power for power-hungry processors, as you already learned in Part 1 .

Front Panel Connections

Front panel connections: HDD LED (hard disk light), power (on/ off) switch and RESET switch in the top row. Below: minispeaker.

All motherboards group the pins that provide front panel functions at the bottom right of theboard. You should find these described in the handbook that came with your motherboard. Theabbreviations printed on the board itself are not particularly helpful for beginners, who may

find the following short explanation of the abbreviations useful.

SP, SPK, or SPEAK: the loudspeaker output. It has four pins.

RS, RE, RST or RESET: connect the two-pin Reset cable here.

PWR, PW, PW SW, PS or Power SW: power switch, the PC's on/ off switch. The plug istwo-pin.

PW LED, PWR LED or Power LED: the light-emitting diode on the front panel of the caseilluminates when the computer is switched on. It is a two-pin cable.

HD, HDD LED: these two pins connect to the cable for the hard disk activity LED.

Don't worry about polarity. The Reset and On/ Off switch will work no matter how they areconnected, but the LEDs will not light up if they are connected in reverse polarity. If you canhear disk activity but the LED does not light, simply reverse the plug.

Final Check

Congratulations - you've done it! You have fitted and connected all components. Before youboot your new computer for the first time, recheck everything. It is very easy to overlooksomething obvious.

Consider the following:
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Motherboard jumper configuration: are the settings for the processor correct?

Drive jumper settings: master/ slave correct?

Are the processor, RAM modules and plug-in cards firmly seated in their sockets?

Did you plug all the cables in? Do they all fit snugly?

Have you tightened all the screws on the plug-in cards or fitted the clips?

Are the drives secure?

Have you connected the power cables to all drives?

Once you have checked all of the above, you can start your PC and install your operatingsystem.

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